exim4 when domain is receaved via tunneling

System: Debian 3.1 Sarge
there are 3 eth interfaces and the lo
on eth0 - I got the net from the provider 192.168.2.253,
on eth1 - I give net via proxy 192.168.1.1
on ethroedu - I got the unitarian.cj.edu.ro domain through a script wich I got from the provider (tunneling)
Link encap:IPIP Tunnel HWaddr
inet addr:10.255.254.94 P-t-P:10.255.254.94 Mask:255.255.255.252
My problem is that I cannot set up exim4 to work properly
I can send email, but I cannot receave
Could anyone solve the problem, to help me how to configure relay at dpkg-recofigure exim4config and stuff related to this
thanks a lot, and I wish all the best to the howtoforge community and expeciallly to Falko who really does the real part of the work
my contact: [email protected]
skype: istvan.juhos